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An ancient Syrian monument that was destroyed last year has been recreated using 3D printing and is now on display in Trafalgar Square. Palmyra's Arch of Triumph was 2,000 years old when it was destroyed by Islamic State militants, but the Institute of Digital Archaeology has managed to create a two-thirds scale model based on photos of the original arch.
The 5.5m-high replica is made from Egyptian marble and will be on show in Trafalgar Square for three days, before going on show in locations around the world including Dubai and New York. The plan is to take it to Palmyra next year and find a permanent home for it near the original arch.
In other news, Greenpeace activists climbed Nelson's Column in protest over air pollution.